Who can tell us the story of "Kongming Lantern" on Mid-Autumn Festival?

Kongming Lantern, also called Sky Lantern, is said to have been invented by Zhu Gekongming (Zhuge Liang) during the Three Kingdoms period. At that time, Zhu Gekongming was besieged by Sima Yi in Yuping, unable to send troops out of the city for help. Kong Ming calculated the wind direction, made a floating paper lantern, tied with the message for help, and then escaped as expected, so later generations called this lantern Kong Ming Lantern. Another way of saying this is that this lantern looks like a hat worn by Zhu Gekongming, hence its name.

Flying Kongming Lantern Video: /player/outer_player.swf? auto = 1 & amp； vid= 124 13205。 uid = 137 1 185877

Modern people put lanterns on Kongming lanterns as a blessing. The wishes of men, women and children to write blessings by hand symbolize the bumper harvest and happiness every year.

During the Daoguang period of the Qing Dynasty, ancestors were introduced into Taibei County, Pingxi Township and Shiliao District of Taiwan Province Province from Hui 'an and Anxi counties in Fujian, that is, the upper reaches of Keelung River. According to the oral accounts of the elders in Shiliao area, bandits occurred in Shiliao area in the early Qing Dynasty. Being located in the mountainous area, all the villagers fled to the mountains. After the bandits left, the people who stayed in the village used sky lanterns as signals at night to inform the villagers who had taken refuge in the mountains that they could go down the mountain and go home. This is also the way to report peace to the villagers. Since the Lantern Festival falls on the fifteenth day of the first lunar month, villagers in ten regions celebrate the Lantern Festival every year and report peace to villagers in neighboring villages. Therefore, villagers in ten areas also call sky lanterns "blessing lanterns" or "safety lanterns". Kongming lantern structure

The structure of Kongming Lantern can be divided into two parts: the main body is mostly bamboo grates, followed by cotton paper or paper paste, and the underframe is bamboo grates. Kongming lanterns can be large or small, round or rectangular. Generally speaking, Kongming lanterns are barrel-shaped made of bamboo pieces, surrounded by thin white paper, and their openings are downward.

When taking off with a light, tie a piece of coarse cloth or gold paper stained with kerosene or peanut oil in the middle of the bracket at the bottom, and light the fuel before flying. After the fire in the lamp burns for a while, it will produce hot air and the lanterns will expand. After flying, the whole lantern will soar in Ran Ran. If the weather is clear and the kerosene at the bottom burns out, the Kongming Lantern will automatically descend. Tools and materials made by Kongming Lantern: A. Copying paper B. Paper cutter C. Scissors D. Needle-nosed pliers E. Cotton thread F. Industrial alcohol G.502 glue H. Iron wire I. Cotton J. Bamboo strips;

Note: Kongming Lantern must be released in windless weather and open places, otherwise it will not fly to the sky and may cause fire. You need 2-3 people to cooperate when flying, and it is strongly required to be accompanied by an adult. In addition, the cable can be tied to the bottom of Kongming Lantern, which can not only fly repeatedly, but also control the take-off height and range to avoid fire.

step

A. Cut the bamboo strips into a thickness of less than 3mm with a paper cutter, then bend the bamboo strips into a circle and fix them with cotton thread or 502 glue. Bamboo is elastic, and bamboo rings are not necessarily round. You can bake it with a small fire and fix the bamboo circle into a circle.

B. Fine copper wire can be obtained by removing the insulation layer outside the waste wire with needle-nosed pliers. But the copper wire should not be too thin, otherwise it will burn easily. Three copper wires can be screwed together to avoid this problem.

C. Cut the tissue paper into pieces of paper with specifications as shown in the figure. Glue one side of the first paper and one side of the second paper together, and then glue the third and fourth sheets together in the same order until a ball with a diameter of about 60 cm is formed. Cut a circular piece of paper and stick the air holes on it. When it is dry, blow up the balloon and find a thin and narrow bamboo stick.

D. Tie the copper wire to both ends of the bamboo circle, and then stick the finished lampshade on the bamboo circle. Tie cotton to a copper wire, soak it in alcohol, light it and you can fly it. Kongming's lanterns should not be too small, otherwise it will be difficult to ascend to heaven.

Allow the plane to take off

On a clear and windless night, one person holds the left and right sides of the lamp bottom, and the other person soaks absorbent cotton with alcohol and lights it until both hands feel that the Kongming Lantern is rising, that is, let go of both hands slowly, and the Kongming Lantern will fly slowly, and the rising height can reach 1000m or so.

Lift-off procedure recommendations:

The making method of Kongming Lantern is simple, but it is greatly influenced by the venue and weather when it is launched. When the wind is strong, it is easy to blow the lamp body obliquely and burn it out. When it rains, it is easy to get wet and cannot be released, so it is best to cast it when there is no wind.

1. First, turn on the lamp body and tie the control lines around and at the bottom.

2. Fill it with fuel.

3. After ignition, the air inlet should be as low as possible to reduce the loss of hot air, but it should not be too low to avoid the flameout due to insufficient oxygen. At the same time, the surrounding control lines must be straightened.

4. When the temperature of hot gas in the lamp body is enough, slowly loosen the surrounding control lines to maintain the lamp body rising steadily. The control line at the bottom must control the rising speed and height of the lamp body.

5. After the sphere is launched, its height and direction can be linearly controlled, and it can also float freely, thus completing the launch. The reason why Kongming Lantern "flies" is that the fuel combustion makes the ambient air temperature rise and the density drop, thus expelling the original air of Kongming Lantern, making its own gravity smaller, and the buoyancy of the air lifts it up.

According to the ups and downs, only when:

F floating > g total =G hot air +G lamp

Namely: g lamp

When it can rise, it can be seen that its own weight (including the gravity of the fuel in the outer pot) must be very light to take off. To what extent?

G light < f float -G hot air = ρ air gV row-ρ hot air gV,

G light